fix youtube embedd

templates/shortcodes/youtube.html

@@ -7,3 +7,16 @@
         allowfullscreen>
     </iframe>
 </div>
+<!-- SEO: VideoObject JSON-LD (confirms this page hosts the embedded video) -->
+<script type="application/ld+json">
+{
+  "@context": "https://schema.org",
+  "@type": "VideoObject",
+  "name": {{ title | default(value=page.title) | json_encode | safe }},
+  "description": {{ page.description | default(value=config.description) | json_encode | safe }},
+  "thumbnailUrl": "https://i.ytimg.com/vi/{{ id | safe }}/sddefault.jpg"
+  {% if page.date %},"uploadDate": "{{ page.date | date(format="%+") }}"{% endif %},
+  "embedUrl": "https://www.youtube-nocookie.com/embed/{{ id | safe }}",
+  "contentUrl": "https://www.youtube.com/watch?v={{ id | safe }}"
+}
+</script>